close apps iphone x

I know, without really understanding it, that there is some debate about whether you should "upward swipe" apps in the Show All screen after double clicking the Home button. I don't really want to go into that, ut I was wondering how that affects the various Track and Trace Covid apps developed...

Do a long-press anywhere on the screen, and after a moment little red circles with minus signs will appear at the top-left corner of each app. You're now in app-closing mode. To close an app, you can either swipe up so it disappears off the top of the screen, or tap the red circle on it. To...